单选题You are developing a class library. Portions of your code need to access system environment variables. You need to force a runtime SecurityException only when callers that are higher in the call stack do not have the necessary permissions. Which call method should you use？（）Aset.Demand（）；Bset.Assert（）；Cset.PermitOnly（）；Dset.Deny（）；
单选题
You are developing a class library. Portions of your code need to access system environment variables. You need to force a runtime SecurityException only when callers that are higher in the call stack do not have the necessary permissions. Which call method should you use？（）
A
set.Demand（）；
B
set.Assert（）；
C
set.PermitOnly（）；
D
set.Deny（）；
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